Explore 800 years of historical sources, from Magna Carta to Obama, in this British Library interactive timeline."/> <meta name="keywords" content="timelines, history timeline, british library timeline, sources from history, school history, chronology, historical douments"/> <meta name="DC.subject" content="timelines, history timeline, british library timeline, sources from history, school history, chronology, historical douments"/> <meta name="DC.title" content="Timelines: Sources from History